A092016 Numbers that can be expressed as the difference of the squares of primes in exactly twenty distinct ways.

885360, 3527160, 3723720, 4444440, 7054320, 8921640, 9304680, 9524760, 9817080, 9849840, 9914520, 10038840, 11152680, 11171160, 12113640, 12543960, 13167000, 13728792, 14108640, 14774760, 15495480, 17264520, 17777760, 17882040

Offset: 1

Author

Ray Chandler, Feb 22 2004

Keywords

• nonn

Examples

			885360 = 941^2-11^2 = 947^2-107^2 = 967^2-223^2 = 977^2-263^2 =
991^2-311^2 = 1123^2-613^2 = 1289^2-881^2 = 1979^2-1741^2 = 2213^2-2003^2 =
2473^2-2287^2 = 2719^2-2551^2 = 3323^2-3187^2 = 4391^2-4289^2 =
7933^2-7877^2 = 11087^2-11047^2 = 13037^2-13003^2 = 14771^2-14741^2 =
18457^2-18433^2 = 44273^2-44263^2 = 55339^2-55331^2
		

Crossrefs

Cf. A090781, A090782, A090788, A092000-A092020.

Extensions

a(12)-a(24) from Donovan Johnson, Nov 26 2008